Caramel Apple Pie - Lemon Stripes

Ingredients

• 1 store-bought pie crust
• 5 large apples, cored, peeled, and sliced
• 1 Tbs lemon juice
• 1/2 cup sugar
• 1/4 cup all-purpose flour
• 1/2 teaspoon cinnamon
• 1/4 teaspoon salt
• 1 stick (8 Tbs) unsalted butter, room temperature
• 1/2 cup all-purpose flour
• 1 cup packed brown sugar
• 1/2 cup oats
• 1/2 tsp salt
• 1/2 cup chopped pecans or walnuts (optional)
• 1/2 cup caramel sauce
• Vanilla ice cream, for serving